a) b - École Polytechnique de Montréal

A-1.2. Experimental Section
A-1.2.1. Materials: HDPE 04352N and PS 615APR were both obtained from the Dow Chemical
Company. PMMA 200336 was purchased from Sigma-Aldrich. An antioxidant, Irganox B225
from Ciba-Geigy, was added to the mixture to reduce thermal oxidation of polyethylene (0.2
weight percent). Physical properties of the materials were measured previously (Reignier &
Favis, 2003a) and are given in Table A-1.1.
Table A-1.1. Homopolymer properties
Polymers M w a ×10-
3 g/mol
M n a ×10-3
g/mol
Melt Index b
ASTM
g/10min
Density b g/cm3 at
20°C 200°C
η 1* × 10-3 c Pa.s
at 200°C
N 1 × 10-4 d Pa at
200°C
HDPE 79 24 4 0.96 0.75 1.2 1.2 2.2 2.2
PS 290 141 15 1.04 0.97 1.7 2.6 11 5.1
PMMA 11.9 7.8 - - 1 0.04 0.04 0.02 0.6
a Measured by GPC, b Obtained from supplier, c η * is the complex viscosity, d N1 is the first normal stress difference, e At average shear rate
during blending:
1
25 −
•
γ = s , f 4
At average shear stress during blending: τ = 2 . 7×
10 Pa
A-1.2.1. Measurement of the interfacial tensions and calculation of the spreading coefficients:
The interfacial tensions were measured using the breaking thread method, as described in an
earlier publication (Reignier & Favis, 2000). The different interfacial tensions and spreading
coefficients for the HDPE/PS/PMMA ternary blends are given in Table A-1.2.
γ&
e
f
τ γ& τ
238